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SVAN 971 User Manual
31
Note: In the case of the infinite integration period or the infinite repetition cycles the
measurement should be stopped manually with the <Start/Stop> key
.
Day time limits
The
Day Time Limits
parameter defines the day and night time limits required by
the local standards. These limits are used for the calculation of the
Lden
function
(see Appendix D for definition). Two options are available:
6H-18H
and
7H-19H
.
By default, it is set to
6H-18H
.
Note: In the Simple interface mode, the Day Time Limits parameter is hidden, but the
instrument will use settings previously defined in the Advanced mode or default settings
(6H-18H)
.
Detector type
The
LEQ Integration
parameter defines the detector
type for calculation of the
Leq
,
Lden
,
LEPd
,
Lnn
and
Sel
results. Two options are available:
Exponential
and
Linear
. The formulae used for the
Leq
calculation are
given in Appendix D. Its value by default is set to
Linear
.
►
Linear
is required for obtaining the true RMS value of the measured signal. When this option is selected
values of the
Leq
,
Lden
,
LEPd
,
Lnn
and
Sel
results do not depend on the detector time constant:
Fast
,
Slow
or
Impulse
(results are displayed without indication of detectors selected in profiles). In this case,
the indicator
Lin.
(or
L
) is displayed in different modes of the result presentation.
Exponential
enables fulfilling the requirements of another standard for time averaged
Leq
measurements. When this option is selected values of the
Leq, Lden, LEPd, Lnn
and
Sel
results depend
on the detector time constant. Results are displayed with the indicator of the detector type selected in
the profiles (
path: <Menu> / Measurement / Profiles
).
Note: In the Simple interface mode, the LEQ Integration
parameter is hidden, but the
instrument will use settings previously defined in the Advanced mode or default settings
(Linear)
.
5.2 S
ETTING UP THE MEASUREMENT TRIGGER
–
M
EASUREMENT
T
RIGGER
The
Meas. Trig.
position appears only in the
Advanced
interface mode and enables setting up parameters of the
measurement trigger. The
Meas. Trig.
is a contexts list
of parameters in which the trigger (
Trigger
) can be
switched
Off
or On by selecting the trigger type (
Level +
,
Level
–
or
Gr
). In the case when trigger is on,
additional parameters can be defined: the measurement
result that is checked for a trigger condition (
Source
), its
threshold level (
Level
) and the speed of the Source value
changing (
Gradient
).
<ENT>
Note: In the Simple interface mode, the Measurement Trigger position is hidden, but the
instrument will use settings previously defined in the Advanced mode or default settings
(Trigger: Off)
.
The trigger condition is checked every 0,5 milliseconds.
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